LG CM 4630 MINI HI-FI SYSTEM – SMPS CIRCUIT DIAGRAM – NO POWER TROUBLESHOOTING - FIRMWARE UPDATE

CM 4630 LG Mini Hi-Fi System – SMPS circuit diagram – No Power troubleshooting - firmware update

HIDDEN KEY MODE

Push both Front key and RCU key to activate it for 5 seconds. 1. Disc Lock On/Off (CD Function Only Active)
„ Front Key : STOP
„ RCU Key : STOP 2. Check Version and Option code
„ Front Key : STOP
„ RCU Key : PLAY/PAUSE
„ You can change [Audio MCU Version <-> CD Controller Version <-> EEPROM Option] by SKIP+/-. 3. Clear EEPROM
„ Front Key : STOP
„ RCU Key : SKIP- 4. Edit EEPROM
„ Front Key : STOP
„ RCU Key : SKIP+
„ You can change the digit of option by SKIP +/-.
„ You can edit 0~f by REPEAT or PLAY/PAUSE key.

5. Bluetooth DUT
„ Front Key : STOP
„ RCU Key : PROGRAM
„ Bluetooth model only 6. Power Disc Lock On/Off (CD Function Only Active)
„ Front Key : STOP
„ RCU Key : EQ 7. Amp Clip On/Off
„ Front Key : STOP
„ RCU Key : Mute
Amp Clip Mode Change (Amp Clip On  > Amp Clip Off  > Level Down display). 8. Demo ALL Key Lock (CM9520/CM8520 Only)
„ Front Key : STOP
„ RCU Key : 9
Demo All Key Lock Change (All Key Lock On  > All Key Lock Off).
- Working on Demo Operation only.
- When All Key Lock, Volume Key work only.
- After All Key Lock Off, it can unlock Demo Mode.

SMPS circuit diagram [Click on the circuit diagram to magnify]

NO-POWER troubleshooting

If the unit doesn’t work by no power problem, repair the set according to the following FUSE & BRIDGE DIODE
Check and replace F901, BD901, TH901 on SMPS board.
How to troubleshoot (Countermeasure)
1) Check if the fuse F901 is open or short-circuit.
2) Check if the bridge diode BD901 is short-circuit by over current with a digital multi meter.
3) Check if the NTC thermistor TH901 is normal or open.

If the unit doesn’t work by no power problem, repair the set according to the following
D929
Solution
Check and replace D929 on SMPS board.
How to troubleshoot (Countermeasure)
1) Check the Anode-Cathode Voltage of D929 with a digital multi-meter, it is normally 0.2 ~ 0.3 V.  => If it doesn’t have any voltage, it’s destroyed. Replace it with a new one.

PROGRAM DOWNLOAD and UPDATE

AUDIO PROGRAM
Download program file name must be CM4530_***.HEX
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.

CD PROGRAM
Download program file name must be HF000_CM4530_xxxxxxxx_xx.bin
Tip) With B/T : HF000_CM4530_xxxxxxxx_xx.bin
Without B/T : HF400_CM4530_xxxxxxxx_xx.bin
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.

EQ PROGRAM
Download program file name must be EQ_PRG_CM4530_***.BIN
If security program (Water Wall) is activated on your PC, you must save the file to the USB storage device and disable the security software, then download the file to your set. Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device. USB device must be unplugged when the downloading process is completed.

AMPLIFIER
Stereo mode 250 W + 250 W (3 Ω at 1 kHz, THD 10 %)
Surround mode (Front) 250 W + 250 W (3 Ω at 1 kHz, THD 10 %)

FRONT SPEAKER
Model CMS4630F
Type 2 Way 2 Speaker
Impedance 3 Ω
Rated Input Power 250 W
Max. Input power 500 W
Net Dimensions (W x H x D) 245 x 343 x 452 mm
Net Weight 5.55 kg